Damper



Nov. 14, 1933. F. F. JACKSON DAMPER Filed April 17. 1931 I N VEN TOR.

A TTORNEYJZ Patented Nov. 14, 1933 DAMPER I Frank 1F. Jackson, Cleveland, Ohio, assignor of one-third to Emerson M. Williams and onethird'to Harvey M. Smith,tboth'of Cleveland,

ApplicationAprill'i, 1931. Serial No. 530.921

5 Claims. (01. -126 2s5) This" invention, relating. I as indicated to dampers, has particular reference to a formof construction designed to be. employed as a damper in flues or stacksconducting hot gases from or to furnaces.

It is well known to those familiar with the art that considerable difficulty has been experienced' in the past in the construction of dampers'due to the intense heat to which such dampers are subjected. Incidental to the intense heating-towhich the dampers are subjected when disposed inthe' path of the heated gases and further, due .to'the' fact E'that usually only a portion, .i. e., the lower end of theidamper pro- 5 jects directly into the path of hotgas .flo-w, internal stresses are set up; whichfwere the damper made in one piece, would cause a'cra'ckingor similar depreciation of the damper. In order to obviate this premature failure ofdampers, it has been common practice to form such dampers of a plurality of sectionslusually arranged in verticallycontiguous relation so as to reduce to a minimum the formation-of internal stresses and to facilitate the replacement and repair of the teriorate. I 7 This sectional form of construction for the dampers has led to a number of difii'culti'es usuallycentering about the means employed for maintaining the sections inproper. assembled relation: A furtherdifiicultywhichhias been encoun'teredin the operation of sectional dampers has been the. tendency of such .constructionsfto warp under the intense heat and due to such warping, causeabinding between the edgesof the damper and the .guide .m eans associated therewith. r It is among the. objectsof my invention to pro- 0 videa form of damper construction whichshall eliminate allof the above-named undesirable characteristics. a a will appearas the descriptionproceeds. 7

T0. the accomplishmentxof the foregoing and relatedends said-invention, then consists of the means hereinafter fully described and particu:.

larly pointed out in the claims. 1

The annexed drawing and the following de-..

scrption set forth in detail certain mechanism embodying the invention, suchfdisclosed means Fig. 1 is a part elevational, part sectional view ortions of the dam r which'most uickl de- Q y .1 and 2 constructed in accordance with the prinadjacent-sections' such as 3, 4 and 5.

Other objects of myinvention showing the apparatus comprising my invention and its associated supportingguides.

Fig. 2 is an elevational view of theback side of the'damper illustrated in Fig. 1.- v

Fig.3 is a transverse sectional view of the apparatus illustrated in Fig. 1 takenon a plane substantially indicated by the line 3-3'.

Fig. 4 is a vertical section view of a portion of the apparatus illustrated Fig. 1, taken on a plane substantialiy indicated. by the line 4-4 andFig. 5 is a fragmentary sectional View drawn struction herein illustrated is designed to be employed as astack .or flue damper and as is well known to-those familiar with the art, such dampers are usually vertically reciprocable in, guide means such as channels 1, which may be builtin or otherwise associated-with the walls of the flue across which the damper is designed to movew V The damper generally indicated. at 2 in Figs.

ciples comprisingimy invention is designed to be .supported dependently from a rod or shaft '3 whichis "employed, to support and manipulate invention is divided into a' plurality of verticall It :will' be noted from. the disclosure of. Figs. land 2 that aplurality of intermediate sections such as 4 may be employed in order to provide a damper of: the required vertical extent. The intermediate members 4 have head and bottom I members 3 and 5 respectively associated therewith for the purposes hereinafter more fully explained. The elements 3; 4 and 5 comprising sections from which the damper is constructed will preferably be formed of a suitable heat resisting alloy; and are provided with horizontally extending concavo-convex ireinforcing portions 6 which may further be reinforced.by'vertically extending ribs 7. Thesereinforcement portions, as above indicated, areconcaveon one side of .the damper members and extend convexly on the opposite side thereof and in combination with the vertically extending ribs produce a structure having strength and a rigidity under the severest strain not equalled by any form of construction hereto-fore employed.

The sections 3, 4 and 5 are secured'in proper assem led. relation in the manner most clearly 11,0

her will have a web of sufiicient vertical extent so that a slight space will be left between the adjacent members 3, 4 and 5 and the groove within which such I-shaped members are engaged will likewise be provided with sufiicient tolerance so that the lower member is movable and dependently supported from the next adjacent upper member.

In order to prevent axial movement of the I-shaped members 10 relatively to the vertically adjacent members joined thereby, I provide looking means such as are most clearly illustrated in Fig. 5. As illustrated in this figure apertures are provided in the Walls bounding the T-shaped grooves in WhlChthG I-shaped member is positioned in which apparatus blocks such as 11 and 12 are positioned and united by means of a screw such as 13. For purposes of convenience, it has-been found that by providing the block 11 with a recess space 14 into which the terminal of the screw 13 projects and then by filling such recess with molten metal such as 15, preferably deposited by means of electric welding and the like, the screw 13 is properly secured to the block 11. The screw 13, i. e., the shaft thereof passes through the aperture provided therefor in the webof the I-shaped member 10 and is maintained'in proper position by means of a nut such as 15. This engagement by the bolt 13 of the I-shaped member 10 and the restraint of the bolt against movement by means of the blocks 11 and 12 eifectively prevents relative movement between such I-shaped member and the damper sections connected thereby.

The bottom member 5 will, of course, have a plain bottom edge instead of being provided with a groove as are the bottom edges of the other damper sections and such bottom section will preferably be much shallower than the other sections for the reason that it is this portion of the damper which projects into the path of the hot gases passing through the flue and by're ducing the vertical extent of such bottom section, the internal stresses in the damper are appreciably reduced and this reduction in the size of the bottom member has a further advantage in that the same may be replaced when deteriorated due to the action or" cost. 7

The top section 3 may be formed in any manner most desirable to properly sustain the body the gasesat a minimum of of the damper and such top section being as' here pendently supported sections which, due to the tolerance between the edges of such sections, enables the several parts of the damper to move relatively to each other to permit movement of the damper within the guides 1 irrespective of any slight irregularity caused by warping of the damper itself. This relative movement between the several parts of the damper is made possible without any sacrifice of effectiveness for the purpose for which it is designed, due to the fact that the weight of the successive parts causes the proper sealing between the several portions of the I-shaped member 10 and the grooves within which it is mounted so that an effective seal across the hue or stack is provided by the assembled structure.

Other advantages incidental to the employment of the apparatus hereinbefore described are believed to be so apparent from the description and the disclosure in the drawing that a further enumeration of such advantages is unnecessary for those familiar with the art.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctiy claim as my invention: 1

1. In a damper, the combination of a plurality of vertically adjacent members, said members having longitudinally extending grooves on adjacent edges, and means engaged by said grooves whereby each of said members excepting the uppermost movably depends from the next vertically adjacent member;

2. In a damper, the combinationof a plurality of vertically adjacent members, longitudinally extending grooves on contiguous edges of said necting members in said grooves, and means associated with the uppermost of said members whereby said damper may be dependently supported. I I

5. In a damper, the combination of a plurality of vertically adjacent members, Tshaped 1ongitudinal grooves extending throughout the con tiguous edges of said members, I-shaped connecting members in said grooves, and means securing said I-shaped'members in said'grooves against axial movement relatively to said members.

FRANK F. JACKSON. 

